*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
/*   box-sizing: border-box; 忽略边框，将整体变成盒子模型 */
}

.header-tool{
    padding-left: 20px;
    margin-top: 20px;
}
.function-tool{
    padding-left:20px;
    margin-left: 5px;
}
